I just went online and read the Boy Scout Oath and Law, something I hadn't done since I was a Scout (and, yes, they had Scouting in my ancient days). I don't see anything in them that would preclude a gay young man or leader per se from joining the Scouts. Both are full of virtuous stuff we'd want any youth, gay or not, to adopt.
Scout Oath: "On my honor I will do my best to do my duty to God and my country and to obey the Scout Law; to help other people at all times; to keep myself physically strong, mentally awake, and morally straight."
Scout Law: "A Scout is: trustworthy, loyal, helpful, friendly, courteous, kind, obedient, cheerful, thrifty, brave, clean, reverent."